Q. 34.3( 143 Votes )

An electric bulb A. 100 W

B. 75 W

C. 50 W

D. 25 W

Answer :

The bulb parameters are as given below:

Power, P = 100W


Potential difference, V = 220V


Then Resistance, R = ?


Now,



This resistance of the bulb will remain constant i.e. 484


Now, when we operate this bulb on 110 V, then,


Power, P =?


Potential difference, V = 110V


And, resistance, R = 484


P =


P = = = 25 W


Thus, the correct answer is: (d) 25 W.

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